Get a wristband for 4 hours and you don't have to say no to the kids.
Let them know the time and how long they have left and they can decide to queue for something popular or have a go on 5 other rides with smaller queues.
We always leave the Jungle River outside until the end. It's great fun but you will get wet (& cold) but they don't mind heading straight to the car after a couple of turns. Turn on the heating and the watch the happy faces fall asleep on the way home.
NB - If you are on the Dart/Bus do NOT do this ride unless you have those poncho things.